Liquid-meter.



No.787,464. 'PATENTED APR.18,|1905.

F. PASCAL.

LIQUID METER. APPLICATION FILED MAR. a1, 19 3.

UNITED STATES Patented April 18, 1905,

PATENT ()EEIcE.

LIQUID-METER.

SPECIFICATION forming part of Letters Patent No. 787,464, dated April18, 1905. Application filed March 31, 1903- Serial NO- 150,468-

To all whom it may concern.-

Be it known that I, FRANoIs UE PAsoAL, a citizen of the Republic ofFrance, residing at Montplaisir, Lyon, France, have invented certain newand useful Improvements in or Belating to Liquid-Meters, of which thefollowing is a specification.

This invention relates to a water-meter of the kind called speed-meterswhich has the advantage over those hitherto designed of being much moresensitive even with a small quantity of water passing through it. In allmeters of this kind the speed of the water is measured by the rotationof a spindle provided in a plane normal to it with a number of inclinedblades the theoretical shape of which is a portion of a helical surface,so that the inclination of each of the elements of the surface gives ita tangential speed proportional to its distance from the axis ofrotation. The movement of the spindle is transmitted, either by means ofan endless screw or by means of a series of toothed wheels, to acounter-gear the hands of which, visible from the outside,indicate thequantity of water consumed. The indications of such an apparatus wouldbe perfect if injurious resistances could be eliminated. The mostimportant of these resistances is due to the friction of the pivots ofthe movable part in its bearings. The meter according to this inventionobviates the drawbacks due to that resistance.

The accompanying drawing shows a meter, in vertical section, providedwith a device according to this invention.

In order to nullify the resistance of the movable part on its pivots,the weight of that part is made equal to the volume of water which itdisplaces. In order to attain this result, the movable part is formed inthe example illustrated as a cylinder a, with thin walls closed at theends by spherical or conical caps, through which pass the pivots b anda, forming the spindle of the cylinder a. Inclined blades (Z, of whichthere may be any desired number, are arranged round the center of thecylinder at and perpendicular to its axis of rotation, the distributionof the masses being such that the axis of inertia coincides with theaxis of rotation of the cylinder (6. The whole is experimentallybalanced in water with great care to insure that its specific gravity beequal to that of water.

The transmission to the clockwork m of the rotary movement imparted tothe blades and to the cylinder by the water passing through the meter iseffected in the usual waythat is to say, by means of an endless screw1;, secured to one of the two pivots of the cylinder 0. Finally, inorder to render the meter more sensitive for very small outputs thefollowing arrangement has been adopted: The support 6 of the lower pivot0 forms a cup provided outside with a jacket z', so as to leave anannular space communicating close under the ends of the blades (Z withthe upper portion of the meter by means of small holes The bottom of thecup 6 is perforated round the pivot c and provided at the bottom with acounter cup f, serving as a seat to a valve g. The valve 9 opens in caseof a large output, and the water entering under the bladescl and roundthe cylinder 0 slides along the whole surface of the blades, causing thecylinder to rotate with a speed in proportion to that of water. When thequantity of water becomes small, the valve g closes under the influenceof its own weight and the water arrives through the holes 1', so that itacts only on the ends of the blades, causing the cylinder to turn with aspeed in proportion to the quantity of water passing through said holesj. For meters with large output the use of two or more of these devicessuperposed will enable the smallest quantities to be registered in anexact Inanner whatever he the output.

What I claim as my invention, and desire to secure by Letters Patent, is

In a liquid-meter, a rotatable cylinder and inclined blades arrangedround the center of the cylinder, the latter and blades having the samespecific gravity as the liquid to be measured, end pivots for thecylinder, the support In testimony whereof I have signed my name for oneof the pivots forming a cup, and a to this specification in the presenceof tWo sub- 10 acket arranged to leave an annular space cornscribingWitnesses.

municating' With the upper portion of the mei *1 ter through openings 1,the bottom of the said FRANLISQUE PASLAL' cup being perforated, acounter cup, f, and Witnesses:

a valve seating in the latter cup and adapted TONY BLIU,

to operate substantially as described. CLAUDE BERLIE.

